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Proceedings Paper

Nonlinear optical frequency conversion with KTP and BiBO crystals for lasers in space
Author(s): Arne Potreck; Helmut Schröder; Melanie Lammers; Georgios Tzeremes; Wolfgang Riede
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Paper Abstract

Within ESA’s ADM-Aeolus and EarthCARE missions Doppler-wind Lidar systems will be operated in the Earth’s orbit to measure global wind profiles. The active instrument will be based on a Nd:YAG laser, frequency tripled by nonlinear optical crystals. Different crystals are therefore to compare and qualify in regard of their space acceptability. A dedicated set-up to measure the maximum conversion efficiencies and its stability during longterm operation for KTP crystals (SHG) and BiBO crystals (SHG and THG) is presented in this work. In order to detect gray-tracking and its influence on thermal lensing in situ, measurements with a Shack-Hartmann sensor and a co-aligned HeNe laser were performed. Conversion efficiencies were 76±3 % at SHG for KTP and BiBO crystals and 48±2 % at THG with a combination of two BiBO crystals. During longterm experiments of 60 million laser pulses, conversion efficiencies were demonstrated to be stable over time (±1 % at SHG with KTP and ±2 % at THG with BiBO). The occurrence of gray-tracking was detected in the KTP crystal and the resulting thermal lensing with an exponential saturation over time was observed in situ.

Paper Details

Date Published: 22 September 2014
PDF: 4 pages
Proc. SPIE 9238, Pacific Rim Laser Damage 2014: Optical Materials for High-Power Lasers, 923808 (22 September 2014); doi: 10.1117/12.2074329
Show Author Affiliations
Arne Potreck, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Helmut Schröder, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Melanie Lammers, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)
Georgios Tzeremes, European Space Agency (Netherlands)
Wolfgang Riede, Deutsches Zentrum für Luft- und Raumfahrt e.V. (Germany)


Published in SPIE Proceedings Vol. 9238:
Pacific Rim Laser Damage 2014: Optical Materials for High-Power Lasers
Takahisa Jitsuno; Jianda Shao; Wolfgang Rudolph, Editor(s)

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